abuild: prune python cache dirs by default

these will be generated post-install in a hook.

ref https://gitlab.alpinelinux.org/alpine/aports/-/issues/11906

abuild.in

@@ -790,6 +790,15 @@ postcheck() {
 		find "$dir" -name '*.la' -type f -delete
 	fi
 
+	# remove all python .pyc cache unless intentionally kept
+	if ! options_has "keeppycache"; then
+		# wildcard should always get the system python dir, and this is faster than
+		# trying to calculate the python version.
+		find "$dir"/usr/lib/python* \
+			\( -type d -a -name "__pycache__" \) \
+			-exec rm -r {} +
+	fi
+
 	# look for /usr/lib/charset.alias
 	if [ -e "$dir"/usr/lib/charset.alias ] \
 			&& ! options_has "charset.alias"; then

tests/abuild_test

@@ -33,7 +33,8 @@ init_tests \
 	abuild_devhelp \
 	abuild_check_maintainer \
 	abuild_cleanoldpkg \
-	abuild_path_with_spaces
+	abuild_path_with_spaces \
+	abuild_pycache
 
 export ABUILD_SHAREDIR=$(atf_get_srcdir)/..
 export ABUILD_CONF=/dev/null
@@ -824,3 +825,54 @@ abuild_path_with_spaces_body() {
 		-e match:"Build complete" \
 		abuild
 }
+
+abuild_pycache_body() {
+	init_keys
+
+	mkdir -p pycachetest
+	cd pycachetest
+
+	cat >APKBUILD <<-EOF
+		# Maintainer: Joe User <juser@example.com>
+		pkgname="pycachetest"
+		pkgver="1.0"
+		pkgrel=0
+		pkgdesc="Dummy test package"
+		url="https://gitlab.alpinelinux.org/alpine/aports"
+		arch="noarch"
+		license="MIT"
+		source=""
+		prepare() {
+			mkdir -p "\$builddir"
+		}
+
+		check() {
+			true
+		}
+
+		package() {
+			mkdir -p "\$pkgdir"/usr/lib/python3.11/site-packages/test/__pycache__/
+			touch "\$pkgdir"/usr/lib/python3.11/site-packages/test/__pycache__/main.cpython-311.pyc
+		}
+	EOF
+
+	abuild clean unpack prepare build rootpkg
+
+	if [ -e pkg/pycachetest/usr/lib/python3.11/site-packages/test/__pycache__/main.cpython-311.pyc ]; then
+		atf_fail ".pyc was not deleted"
+	fi
+
+	if [ -e pkg/pycachetest/usr/lib/python3.11/site-packages/test/__pycache__ ]; then
+		atf_fail "__pycache__ dir was not deleted"
+	fi
+
+	options="keeppycache" abuild clean unpack prepare build rootpkg
+
+	if ! [ -e pkg/pycachetest/usr/lib/python3.11/site-packages/test/__pycache__/main.cpython-311.pyc ]; then
+		atf_fail ".pyc was deleted but shouldn't have been"
+	fi
+
+	if ! [ -e pkg/pycachetest/usr/lib/python3.11/site-packages/test/__pycache__ ]; then
+		atf_fail "__pycache__ dir was deleted but shouldn't have been"
+	fi
+}